Пример #1
0
// Predict outputs a base.Instances containing predictions from this tree
func (d *DecisionTreeNode) Predict(what *base.Instances) *base.Instances {
	outputAttrs := make([]base.Attribute, 1)
	outputAttrs[0] = what.GetClassAttr()
	predictions := base.NewInstances(outputAttrs, what.Rows)
	for i := 0; i < what.Rows; i++ {
		cur := d
		for {
			if cur.Children == nil {
				predictions.SetAttrStr(i, 0, cur.Class)
				break
			} else {
				at := cur.SplitAttr
				j := what.GetAttrIndex(at)
				if j == -1 {
					predictions.SetAttrStr(i, 0, cur.Class)
					break
				}
				classVar := at.GetStringFromSysVal(what.Get(i, j))
				if next, ok := cur.Children[classVar]; ok {
					cur = next
				} else {
					var bestChild string
					for c := range cur.Children {
						bestChild = c
						if c > classVar {
							break
						}
					}
					cur = cur.Children[bestChild]
				}
			}
		}
	}
	return predictions
}